On http://wiki.team-mediaportal.com/ right below "Advanced", the "Plugins (in MP)" link is dead
And on http://wiki.team-mediaportal.com/1_...in_Developer's_Guide/3_Distribute_your_plugin the "plugins repository" too
And on http://wiki.team-mediaportal.com/1_...in_Developer's_Guide/3_Distribute_your_plugin the "plugins repository" too